Valve Lift
07-25-2008, 11:21 AM
#2
Former Vendor
Depends on what engine we will be working with.
LS2 has a 0.525" lift on both lobes. Divide that by 1.7 and you get 0.3088" actual cam lift. Now, multiply that by 1.8 and the new gross lift is 0.556".
The LS3 has 2 different lifts. The intake would go from 0.551" to 0.583" lift. The exhaust goes from 0.525" to 0.556" lift.
The LS7 also has 2 different lifts. The intake would go from 0.593" to 0.627" lift. The exhaust would go from 0.589" to 0.623" lift.
When replacing the stock rocker to a higher ratio rocker, the cam duration changes by a couple of degrees.
LS2 has a 0.525" lift on both lobes. Divide that by 1.7 and you get 0.3088" actual cam lift. Now, multiply that by 1.8 and the new gross lift is 0.556".
The LS3 has 2 different lifts. The intake would go from 0.551" to 0.583" lift. The exhaust goes from 0.525" to 0.556" lift.
The LS7 also has 2 different lifts. The intake would go from 0.593" to 0.627" lift. The exhaust would go from 0.589" to 0.623" lift.
When replacing the stock rocker to a higher ratio rocker, the cam duration changes by a couple of degrees.
07-25-2008, 04:16 PM
#4
"the cam duration changes by a couple of degrees."
???
I believe the actual opening event and closing events ground into the cam lobe are unchanged...however, the duration when measured at .050" lift should change about 5.9% because the change from 1.7 to 1.8 rockers lifts the valve at a faster rate through the cycle...right?
NS
???
I believe the actual opening event and closing events ground into the cam lobe are unchanged...however, the duration when measured at .050" lift should change about 5.9% because the change from 1.7 to 1.8 rockers lifts the valve at a faster rate through the cycle...right?
NS
07-25-2008, 06:04 PM
#5
Former Vendor
"the cam duration changes by a couple of degrees."
???
I believe the actual opening event and closing events ground into the cam lobe are unchanged...however, the duration when measured at .050" lift should change about 5.9% because the change from 1.7 to 1.8 rockers lifts the valve at a faster rate through the cycle...right?
NS
???
I believe the actual opening event and closing events ground into the cam lobe are unchanged...however, the duration when measured at .050" lift should change about 5.9% because the change from 1.7 to 1.8 rockers lifts the valve at a faster rate through the cycle...right?
NS